How to remove fields from json in go?

Question

I've this struct in my code.

type AppVersion struct {
    Id            int64     `json:"id"`
    App           App       `json:"app,omitempty" out:"false"`
    AppId         int64     `sql:"not null" json:"app_id"`
    Version       string    `sql:"not null" json:"version"`
    Sessions      []Session `json:"-"`
    SessionsCount int       `sql:"-"`
    CreatedAt     time.Time `json:"created_at"`
    UpdatedAt     time.Time `json:"updated_at"`
    DeletedAt     time.Time `json:"deleted_at"`
}

I'm building a webservice and I don't need to send the App field in the JSON. I've tried a few things to remove the field from the JSON but I haven't been able to do it.

How can I achieve this? Is there any way to set struct as empty?

I'm using GORM as database access layer, so I'm not sure if I can do App *App, do you know if it will work?

I've tried and it doesn't work, there's a problem with database creation / migration — ventayol
– ventayol, Commented Oct 24, 2014 at 15:58
Well, that sounds like a problem with GORM. You could implement your own json.Marshaler and json.Unmarshaler on AppVersion if you want to further control serialization outside of the spec of the json package. — Mr_Pink
– Mr_Pink, Commented Oct 24, 2014 at 16:15
you implement MarshalJSON and UnmarshalJSON on AppVersion. The json package will call those methods if they exists instead of using its own reflection based marshaling. — Mr_Pink
– Mr_Pink, Commented Oct 24, 2014 at 16:38

Jasmeet Singh · Accepted Answer · 2014-10-24 14:21:25Z

2

type AppVersion struct {
    Id            int64     `json:"id"`
    App           App       `json:"-"`
    AppId         int64     `sql:"not null" json:"app_id"`
    Version       string    `sql:"not null" json:"version"`
    Sessions      []Session `json:"-"`
    SessionsCount int       `sql:"-"`
    CreatedAt     time.Time `json:"created_at"`
    UpdatedAt     time.Time `json:"updated_at"`
    DeletedAt     time.Time `json:"deleted_at"`
}

More info - json-go

answered Oct 24, 2014 at 14:21

Jasmeet Singh

2,5671 gold badge13 silver badges10 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

ZeissS · Accepted Answer · 2014-10-24 14:27:38Z

1

You should be able to wrap your data structure into a custom type which hides the app field:

type ExportAppVersion struct {
   AppVersion
   App `json:"-"`
}

This should hide the App field from being exposed.

edited Oct 24, 2014 at 14:27

user142162

answered Oct 24, 2014 at 13:51

ZeissS

12.2k4 gold badges38 silver badges50 bronze badges

3 Comments

ventayol Over a year ago

The problem os setting the json:"-" is that then I miss the field when decoding the json.

ventayol Over a year ago

Also I would like to have the option to control when I want to send it back or not.

ZeissS Over a year ago

Don't wrap it in this struct if you want to deserialize / send it.

Collectives™ on Stack Overflow

How to remove fields from json in go?

2 Answers 2

Comments

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related